Connection Technology for Hazardous Areas

The ease of handling of the 221 Series is also reproduced in the version for hazardous areas: Pull the lever up, insert a conductor, release the lever.

The 221 Series connectors can be used in a wide range of applications, not only because they are available as 2-, 3- or 5-conductor terminal blocks, but also because of the different versions: The 4 mm² version of the 221 Series allows you to use fine-stranded conductors from 0.2 to 4 mm², while the mm² version connects all conductor types from 0.5 to 6 mm² (20–10 AWG).

For use with a mounting carrier, the following rule applies depending on the required working voltage: If the terminal blocks are placed directly next to each other in the carrier, the working voltage is 275 V. However, if the terminal blocks are inserted in such a way that a spacer is visible between each pair, the working voltage can be up to 440 V. This ensure compliance with the creepage distances and clearances required by the standard.

The 2-, 3- and 5-conductor terminal blocks can be inserted into the matching mounting carrier. The carrier can either be clamped onto a mounting rail or screwed tightly to any smooth surface. A decisive advantage for applications in hazardous areas: Even once the terminal block has been inserted into the carrier, conductors can still be connected and disconnected, e.g., if only individual conductors have to be rewired.